Frodo taking a nap...
5D3 with a 135mm f4.7 Graphex Optar lens adapted via a kludge (bellows extension, bored out C to EOS adapter).
I used the iris on the lens and the shutter on the body for this one. I've taken others where I've used the iris and shutter on the lens and simply set the body for "B".
With Live View the whole process becomes fairly straightforward and enjoyable, if somewhat difficult to hand hold.